Details? And, um, we had an official Communist Party back then, and maybe still do, and the people in it were not killed, so... maybe what you're implying isn't a reasonable inference?

We do, the CPUSA is still a thing. However, back in the apex of its popularity and influence (interwar period) the people in it were killed, or intimidated, harassed, or imprisioned, over the course of the two major Red Scares.

However I was thinking in particular of people like Fred Hampton, a young progressive with an electrifying oratory style who commanded the respect and admiration of his people, advocated for anti-capitalism resistance, self-relience, self-government. The most dangerous kind of subversive: idealist in words, pragmatist in actions. He was assassinated at the peak of his popularity by the FBI on explicit orders of the top of American government.

Read the introduction of https://en.wikipedia.org/wiki/COINTELPRO to get an idea of the sort of things we are talking about: intimidation, violence, imprisonment, and assassination if need be, target on people from the Black Panther Party to environmentalists.

OK. Got anything that was only two or three decades ago, like you said you had?

You mean the thousand that died because USA supported literally the Nazis of the world against totally legal socialist nations, they did not like?

Or the countless innocents that died because USA fabricated false evidence to invade foreign countries, not aligned with their interests?

each decade had its own operation condor from the US since the end of WW2

A recent example, happened less than a decade ago

https://fair.org/home/as-lula-emerges-from-prison-us-media-i...

I will ping you when today's documents are declassified, circa 2070 ;)